Tournaments

There's been quite a few bugs with tournaments recently. Therefore I've decided to rewrite the tournament code.

This may affect existing tournaments so I'm wondering whether people would prefer:
1. We just start over and remove existing tournaments and associated debates
2. We restart all existing tournaments with the new system
3. We try to transfer tournaments as best we can (though this will have issues with already bugged debates)

What would you like?

admin: @Mharman said to me in chat he'd prefer option 2.